WO2018196912A1

WO2018196912A1 - Central release mechanism having decoupled path measurement

Info

Publication number: WO2018196912A1
Application number: PCT/DE2018/100278
Authority: WO
Inventors: Jan Grabenstätter
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-04-26
Filing date: 2018-03-27
Publication date: 2018-11-01
Also published as: DE102017108877A1; DE112018002196A5

Abstract

The invention relates to a central release mechanism (1) for a clutch release system or brake release system for a motor vehicle, having a housing (2), having a piston (3), which can travel axially relative to the housing (2), and having a path measurement system (4), which has a position sensor (5) coupled to the piston (3) of the central release mechanism (1) in order to determine a position in an axial direction of the piston (3) of the central release mechanism (1), wherein the position sensor (5) is attached to a lever (6) connected to the piston (3) of the central release mechanism, and wherein the lever (6) is designed such that the lever has at least two degrees of rotation between the position sensor and a coupling point (7) between the piston (3) of the central release mechanism (1) and the path measurement system (4).

Description

Central release with decoupled displacement measurement

The invention relates to a Zentralausrücker / Kupplungsnehmer for a hydraulic or electric Kupplungsausrücksystem or Bremsausrücksystem for a motor vehicle with a housing having an axially movable piston from the housing and a Wegmesssystem having a coupled to the piston position sensor for determining a position in an axial direction , that is, has an X-direction or an X-axis of the piston.

From the state of the art are already Wegmesssysteme for Zentralausrücker in

Clutch release systems known. For example, the unpublished DE 10 2017 101 639 A1 discloses a Zentralausrücker for a hydraulic or pneumatic clutch actuator, preferably for a Kupplungsbe- actuating device of a motor vehicle to fit a housing and thus at least translationally firmly connected, acting as a pressure chamber cylinder, in particular one Cylinder with an annular cross-section and a piston, in particular an annular piston, which is translationally displaceable in the cylinder and a position determining unit with which a signal with respect to the translational position of the piston relative to the housing can be generated, the Zentralaus- rer backer a transmission with a rotary element wherein with the gear, the translational movement of the piston is convertible into a rotational movement of the rotary member and the position determining unit is adapted to a signal with respect to the angular position to generate the rotation element. However, the prior art always has the disadvantage that so-called wobbling movements of the release bearing, which results from a clearance between a guide aid of the clutch slave cylinder and the piston, create a disturbing basic signal for the path signal to be measured of the piston, so that the position of the piston is not is detected correctly. This results in measurement inaccuracies of up to one millimeter, which are to be avoided. However, since the play between the guide sleeve and the piston is unavoidable, in particular when using plastic pistons, or an avoidance of the play is not desired, but a larger clearance leads to higher tumbling movements of the bearing, the existing The prior art solutions are not sufficient to accurately detect the travel position of the piston.

It is therefore the object of the invention to avoid or at least reduce the disadvantages of the prior art. In particular, a Zentralausrücker to be developed with a displacement measuring system, in which the measurement of the displacement sensor is decoupled from the wobbling motion between the bearing and the displacement sensor, so that the displacement signal of the piston can be measured accurately. The object of the invention is achieved in a generic device according to the invention in that the position sensor is attached to a connected to the piston of the central release lever, wherein the lever is designed so that it is between the position sensor and a point of articulation between the piston of the Zentralausrückers and the Position measuring system has at least two Rotationsfreiheits- grade. In this case, a position between the position sensor and the articulation point means that the position sensor and the articulation point are included, so that a rotational degree of freedom can also be integrated in the position sensor or the articulation point. In this case, the point of articulation between the piston of the central release and the distance measuring systems in an axially displaceable point whose position it is to be considered.

This has the advantage that even with a tumbling motion of the piston with a release bearing, ie upon pivoting of the piston about an axis perpendicular to the disengagement axis, ie the axial direction, the position of the piston in the axial direction can be accurately detected.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below. In addition, it is expedient if the lever is designed such that it has a first rotational degree of freedom about an axis perpendicular to the axial direction, that is independent first axis, ie a Y-axis, and a second rotational degree of freedom about a to the axial direction and to the first axis , ie independent second axis, ie Z-axis, owns. Furthermore, it is advantageous if the lever has a first pivot which allows or decouples a rotation about the first axis. It is also advantageous if the lever has a second pivot which allows or decouples a rotation / pivoting about the second axis.

A favorable embodiment is characterized in that the lever has a rotary lever, wherein the rotary lever is pivotally connected to the housing via the first rotary joint or the second rotary joint.

Furthermore, it is expedient if the lever has a fork which is rotatably connected to the rotary lever via the first rotary joint or the second rotary joint and is in rolling contact with the piston of the central release device at the articulation point.

Further, it is advantageous if the fork at its end, which is in rolling contact with the pivot point, has a concave surface / crown, so that a rolling of the concave surface / crown on the piston of the central release is made possible. It is also preferable if the fork is in point contact with the piston of the central retainer at the point of articulation.

Further, it is advantageous if a cylinder-distal end of the lever is spring-biased against a disengagement of the piston of the central release.

In this case, the spring may be mounted both on the one side of the first rotary joint or of the second rotary joint and on the other side of the first rotary joint or of the second rotary joint. In addition, it is expedient if the position sensor is movable on a circular path about the first rotary joint or the second rotary joint.

A preferred embodiment is characterized in that the position sensor is mounted on a translationally guided component, wherein the translational movement is forced by a rotation of the lever. It is also advantageous if a circuit board is arranged so that the position sensor is guided along when disengaging the piston of the central pusher as the circuit board. The printed circuit board can be arranged laterally, above or below the position sensor.

In other words, the invention relates to a displacement measuring system for a central release / clutch slave cylinder. Since in conventional Wegmesssytemen for central release by the game between the guide sleeve of Kupplungsnehmerzylin- and the piston, a tumbling motion of the bearing is allowed, a disturbing basic signal can be caused by a greater game on the path signal. In particular, when using plastic piston larger games are expected in conjunction with higher tumbling movements of the camp. In order to counteract this effect, it is proposed according to the invention to decouple the tumbling motion of the bearing from the displacement measurement of the displacement sensor. So the transmission of the distance measuring signal to the circuit board is not translational, but rotationally designed via a pivot point. The rotary lever provided for this purpose is pivotally arranged at a pivot point with respect to the housing, wherein a fork is connected to the rotary lever at so that it is rotatably mounted about its axis. As a position sensor, a magnet is usually used, which can be arranged in two different variants. In a first variant, the position sensor is arranged directly on the rotary lever, so that it moves in rotation with the rotary lever. In a second variant, the displacement measuring system is designed such that the rotary lever actuates a slide translationally movable in a guide, the position sensor, that is to say the magnet, being arranged on the slide. On a release bearing, which is coupled to the disengagement of the piston of the central release, there is a support ring on which a fork is supported via a roll-off point. This unwinding point is relatively far away from the printed circuit board, so that it is advisable not to translate the transmission of the path signal to the printed circuit board, but rather to rotate it via a pivot point. At this pivot point, the rotary lever is pivotally arranged with respect to the housing, wherein the fork is additionally mounted in the rotary lever so that it is rotatably mounted about its axis. In a first embodiment, the position sensor, so the magnet is directly on the rotary lever and is guided along a circular path around the pivot point between the housing and the rotary lever. In a second embodiment, the rotary lever actuates by its rotary movement / pivoting movement about the fulcrum in a guide translationally guided slide on which the position sensor, so the magnet is located. The position sensor is thus guided past the process of the release bearing, so when moving the piston on the circuit board. The circuit board may be arranged laterally from the magnet, but also above or below the magnet. In addition, a spring is provided which ensures that the rolling point of the fork is pressed against the support ring on the release bearing. So take tumbling movements about the Y-axis, ie an axis perpendicular to the axial direction, so the support ring pivots about the rolling point of the fork, so that almost no movement is transmitted in the axial direction. If tumbling movements occur around the Z-axis, ie about an axis which is perpendicular to the axial direction and perpendicular to the Y-axis, then the fork rotates in the rotary lever, ie about its axis, so that only slight movements in the axial direction be transmitted. Mainly in the disengaged position, the tumbling movements are transmitted around the Z axis, since there the inclination of the axis of rotation of the fork with respect to the Z-axis is greatest. The fork is formed from a steel wire which is suspended in the rotary lever.

The invention will be explained below with the aid of a drawing. Show it:

Fig. 1 is a schematic representation of a Zentralausrückers with a

Position measuring system in a first embodiment in the engaged and disengaged position,

Fig. 2 is a schematic front view of the Zentralausrückers with the

Wegmesssystem in the first embodiment, Fig. 3 is a schematic side view of the Zentralausrückers with the

Distance measuring system in a second embodiment with a

translationally guided slide with an engaged piston, 4 shows a schematic side view of the central release in the second

Embodiment with the disengaged piston,

5 shows a side view of a realization of the decoupling between the

Zentralausrücker and the distance measuring system and

a front view of the decoupling between the Zentralausrücker and the distance measuring system.

The figures are merely schematic in nature and serve only to understand the invention. The same elements are identified by the same reference numerals.

Fig. 1 shows a Zentralausrücker 1, which is designed for actuating a clutch or a brake of a motor vehicle. The central release 1 has a housing 2, in which an axially movable relative to the housing 2 piston 3 is arranged. An axial direction of the piston 3 is indicated in the figures as an x-axis / x-direction. The central disengager 1 also has a position measuring system 4, which has a position sensor 5 coupled to the piston 3 of the central disengager 1. This means that a movement of the piston 3 inevitably causes a (guided) movement of the position sensor 5.

The position sensor 5 is attached to a lever 6 connected to the piston 3 of the central release 1. The lever 6 is coupled via a pivot point 7 on the piston 3. The lever 6 is formed so that it has at its piston near end 8 a ball 9, which can roll on the pivot point 7 via a support ring 10 on a with the piston 3 in the axial direction movable release bearing 1 1. The release bearing 1 1 is thus actuated via the piston 3, wherein the release bearing disengages when the piston 3 is moved in a positive x-direction, and engages when the piston 3 is moved in a negative x-direction.

The lever 6 is formed to have two rotational degrees of freedom between the position sensor 5 and the hinge point 7. The first rotational degree of freedom is realized via a first pivot 12, which allows a rotational degree of freedom of the lever 6 about a first axis perpendicular to the axial direction / x direction. In the The first axis is the y-axis. The first rotary joint 12 thus permits a pivoting of the lever 6 relative to the housing 2 about the y-axis.

The second degree of freedom of rotation is realized by means of a second pivot 13, which allows a rotational degree of freedom of the lever 6 about a second axis perpendicular to the axial direction and to the first axis / y-axis. In the figures, the second axis is the z-axis. That is, the lever 6 is rotatable in itself about its own axis. The second rotary joint 13 thus couples two mutually rotatable components of the lever 6 with each other. A piston remote part of the lever 6 is a rotary lever 14, and a piston closer part of the lever 6 is a fork 15th

The fork 15 is the part of the lever 6 which is in contact with the support ring 10 at the point of articulation 7. The fork 15 is thus rotatably connected to the rotary lever 14 and can roll on the support ring 10. Thus, a tumbling motion of the piston 3 is compensated with the release bearing 1 1 about the z-axis.

The lever 6 is biased by a spring 16 so that the fork 15 is pressed in the axial direction. This means that the fork 15 is always pressed against the support ring 10. The ball 9 is thus always pressed against the support ring 10, so that it rolls on a rotation of the fork 15 relative to the rotary lever on the support ring 10 along. Due to the bias of the spring 16, the fork 15 at the pivot point 7 never loses contact with the support ring 10. However, this means that the pivot point 7 is movable and shifts with the tumbling motion of the piston 3 about the z-axis. The spring 16 is mounted on the rotary lever 14 of the lever and thus biases a piston remote end of the lever 6 against the disengagement of the piston 3.

The position sensor 5 is disposed in the distal end of the lever 6. When pivoting the lever 6 about the y-axis, which is caused by a displacement of the piston 3 in or against the axial / disengaging, the position sensor 5, which is designed as a magnet, laterally guided past a circuit board 17. The position sensor 5 can also be passed above or below the printed circuit board 17. Due to the relative position of the position sensor 5 opposite the circuit board 17 can therefore be calculated / closed, as far as the piston 3 of the central release 1 is disengaged.

In the first embodiment (see FIGS. 1, 2, 5, and 6), the position sensor 5 is attached directly to the lever 6. In the second exemplary embodiment (cf. FIGS. 3 and 4), the position sensor 5 is arranged in a slide 19 guided in a translatory manner by a guide 18, so that a linear position of the position sensor 5 has to be measured in order to draw conclusions about the disengagement position of the piston 3 to draw.

In Fig. 2 it can be seen that the fork 15 has a first leg 20 and a second leg 21 which are connected via a mounted in the rotary lever 14 web of the fork 15. During a wobbling movement in the one direction about the z-axis, the first leg 20 moves to the left as viewed along the circumference and the second leg 21 moves to the right as seen along the circumference, and moves around the z-axis during a tumbling motion in the other direction first leg 20 to the right and the second leg 21 to the left. This is made possible by the unrolling of the ball 9, which may also be formed as a convex sublime or convex surface which bears against the support ring 10 (cf. FIG. 5).

A tumbling motion of the release bearing 1 1 about the y-axis is thus by the first pivot 12, which allows pivoting of the lever 6 about the y-axis, and by the rolling of the fork 15 on the support ring, ie the pivot point 7 of the position measuring system. 4 on the piston of the central release 1, balanced. A wobbling movement of the release bearing 1 1 about the z-axis is compensated by the second pivot 13, which allows a rotation of the fork 15 relative to the rotary lever 14, so a rotation of the lever 6 in itself.

The piston 3 of the central release device 1 is surrounded by a folding bellows / bellows 22 for protection against dirt and dust.

In Fig. 1, the central release 1 is shown in a figure in a disengaged position of the piston 3 and an engaged position of the piston 3 to the movement to clarify the lever 6. In contrast, the piston 3 is shown in Fig. 3 in an engaged position and in Fig. 4 in a disengaged position.

List of references Zentralausrücker

casing

piston

displacement measuring system

position sensor

lever

articulation

piston end

Bullet

support ring

release bearing

first rotary joint

second pivot

lever

fork

feather

circuit board

guide

carriage

first leg

second leg

bellows

Claims

claims

Central release device (1) for a clutch release system or brake release system for a motor vehicle, comprising a housing (2) with one opposite the housing

(2) axially movable piston

(3) and with a displacement measuring system

(4) having a position sensor (5) coupled to the piston (3) of the central release (1) for determining a position in an axial direction of the piston (3) of the central release (1), characterized in that the position sensor

(5) is attached to a lever (6) connected to the piston (3) of the central release (1), the lever (6) being arranged to be interposed between the position sensor and a point of articulation (7) between the piston (3 ) of the central release (1) and the displacement measuring system (4) has at least two degrees of rotation.

The central trip unit (1) according to claim 1, characterized in that the lever (6) is formed to have a first rotational degree of freedom about a first axis perpendicular to the axial direction and a second rotational degree of freedom about a second perpendicular to the axial direction and to the first axis Has axis.

Central release device (1) according to claim 2, characterized in that the lever (6) has a first pivot (12) allowing rotation about the first axis.

Central release device (1) according to claim 2 or 3, characterized in that the lever has a second pivot (13) which allows rotation about the second axis.

Central release device (1) according to claim 4, characterized in that the lever (6) has a rotary lever (14), wherein the rotary lever (14) via the first pivot (12) or the second pivot (13) on the housing (2) is pivotally connected.

6. Zentralausrücker (1) according to claim 5, characterized in that the lever (6) has a fork (15) via the first pivot (12) or the second pivot (13) on the rotary lever (14) is rotatably connected and at the articulation point (7) in rolling contact with the piston (3) of the Zentralausrückers (1).

7. Zentralausrücker (1) according to one of claims 1 to 6, characterized in that a piston remote end of the lever (6) against a disengagement of the piston (3) of the Zentralausrückers (1) is spring-biased.

8. Zentralausrücker (1) according to one of claims 4 to 7, characterized in that the position sensor (5) on a circular path about the first pivot (12) or the second pivot (13) is movable.

9. Zentralausrücker (1) according to one of claims 1 to 7, characterized in that the position sensor (5) on a translationally guided component (19) is mounted, wherein the translational movement by a rotation of the lever (6) is enforced.

10. Zentralausrücker (1) according to one of claims 1 to 9, characterized in that a circuit board (17) is arranged so that the position sensor (5) upon disengagement of the piston (3) of the Zentralausrückers (1) on the circuit board (17 ) is guided along.